RFR: 8346717: serviceability/dcmd/vm/SystemDumpMapTest.java failing on Windows with "Stack base not yet set for thread id" [v3]

[Simon Tooke]

> This test fixes an issue with incomplete Windows threads not yet having a stack.  A test for a null stack_base is added to guard against the potential null dereference.  An additional test using ZGC is added to the jtreg SystemMapTest.

Simon Tooke has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Merge branch 'openjdk:master' into pr_8346717
 - refine jtreg tags per review
 - Merge branch 'pr_8346717' of https://github.com/stooke/jdk into pr_8346717
 - restore deleted function name
 - add ZGC run of SystemMapTest
 - fix test for unready thread on Windows

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22870/files
  - new: https://git.openjdk.org/jdk/pull/22870/files/9819f027..f47f9425

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22870&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22870&range=01-02

  Stats: 17637 lines in 241 files changed: 6043 ins; 10628 del; 966 mod
  Patch: https://git.openjdk.org/jdk/pull/22870.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22870/head:pull/22870

PR: https://git.openjdk.org/jdk/pull/22870